Avaliação da qualidade de diferentes marcas comerciais de milho-pipoca

The far west region of Santa Catarina (FWSC) state in southern Brazil was indicated as a microcenter of diversity of the Zea genus. In this region, local popcorn varieties are grown in small areas, but in a significant number of farms. The present study aimed to characterize the diversity of 41 local populations from that region, based on phenology and morphological characters of plant, ear and grain. Therefore, an experimental design of complete randomized blocks with two replications was conducted. The data allowed to identify a rich diversity of popcorn in the FWSC for the characteristics of plant, ear, and grain, as well as for the phenology. For the color, 20 populations presented white grain, nine black, nine yellow, two red and one orange. Regarding the cycle, all varieties of yellow and round grains were considered hyper early/early and the varieties of white grains, intermediate/late. Average plant height varied from 1.8 to 3.2 m, while the weight of one thousand kernels varied from 80.9 to 200.4 g. The accumulated day degrees for tasseling ranged from 689.05 to 1,090.57. Based on the cluster analysis of qualitative and quantitative characters, three groups were formed, and five populations were isolated. The inclusion of plant characteristics and phenology can be an important and complementary tool for studies in popcorn races. Trends in some plant characteristics were observed within popcorn varieties with the same grain features. This result is important information for popcorn genetic breeding strategies.

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Relationship between phenological and morphological characteristics of plant with popcorn races of a diversity microcenter in southern Brazil

Júnior

Ogliari

Maghelly

et al. 2021

RSD

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Rank-ordering coefficients of variation for popping expansion

Milani

2011

Acta Sci. Agron.

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ABSTRACT. The coefficient of variation (CV) has been the most important statistic to determine the precision of experimental errors, but an even classification for guiding popcorn breeders is still lacking for popping expansion. The normality of data from 50 CVs was tested through the Shapiro-Wilk test, and the mean (m), median, standard deviation (SD), maximum and minimum values, asymmetry and kurtosis were all determined using the momentum method. The CVs were ranked as low [CV < (m -1 SD)], moderate [(m -1 SD) < CV < (m + 1 SD)], high [(m + 1 SD) < CV < (m + 2 SD)] and very high [CV > (m + 2 SD)]. In summary, these data were close to the normality because the slight and flattened curve was skewed to the right. The CV's mean was 11.08, the median was 11.94 and the standard deviation was 5.13%. Accordingly, values of CV ≤ 5.95% are low, 5.95 < CV ≤ 15.21% are moderate, 15.21 < CV ≤ 20.34% are high, and CV > 20.34% are very high.Keywords: Zea mays, dispersion measurement, genetic improvement, precision, accuracy.RESUMO. Classificação de coeficientes de variação para capacidade de expansão. O coeficiente de variação (CV) tem sido o parâmetro estatístico mais importante para determinar a precisão de erros experimentais, sendo necessária uma classificação para orientar os pesquisadores de milho-pipoca para a capacidade de expansão. Assim, a normalidade de 50 CVs foi avaliada por meio do teste de Shapiro-Wilk; a média (m), mediana, desvio padrão (DP), valores máximos e mínimos, assimetria e curtose foram estimados utilizando o método dos momentos. Os CVs foram classificados como baixo [CV < (m -1 DP)], moderado [(m -1 DP) < CV < (m + 1 DP)], alto [(m + 1 DP) < CV < (m + 2 DP)] e muito alto [CV > (m + 2 DP)]. Em resumo, os dados aproximaram à normalidade e a curva normal foi desviada para a direita e ficou ligeiramente achatada. A média dos CVs foi de 11,08, a mediana foi de 11,94 e o desvio padrão foi de 5,13%. Assim, valores de CV ≤ 5,95% devem ser classificados como baixos, 5,95 < CV ≤ 15,21% são moderados, 15,21 < CV ≤ 20,34% são elevados e CV > 20,34% são muito elevados.Palavras-chave: Zea mays, medidas de dispersão, melhoramento genético, precisão, acurácia.

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Avaliação da qualidade de diferentes marcas comerciais de milho-pipoca

Cited by 2 publications

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Relationship between phenological and morphological characteristics of plant with popcorn races of a diversity microcenter in southern Brazil

Relationship between phenological and morphological characteristics of plant with popcorn races of a diversity microcenter in southern Brazil

Rank-ordering coefficients of variation for popping expansion

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